AT&T users can keep unlimited data plans even when upgrading to iPhone HD/iPhone 4Gâ€¦ unless they want tethering. And how to check your data usage.

The good news is, existing iPhone users with the $30 unlimited data plan can keep that plan even if upgrading to the next generation iPhone HD/iPhone 4G this summer — unless you want to tether, at which point you’ll need to switch to one of the new AT&T tiered pricing data plans for smartphones.

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